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Java ORM Common DAO(Data Access Object), eliminate the interface and implements of DAO.

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package cn.easyproject.easycommons.commondao.factory;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

/**
 * EasyCommonDAO HibernateSessionFactory Configures and provides access to
 * Hibernate sessions, tied to the current thread of execution. Follows the
 * Thread Local Session pattern.
 * 
 * @author Ray
 * @author [email protected]
 * @author easyproject.cn
 * @since 1.0.0
 */
public class HibernateSessionFactory {

	/**
	 * Location of hibernate.cfg.xml file. Location should be on the classpath
	 * as Hibernate uses #resourceAsStream style lookup for its configuration
	 * file. The default classpath location of the hibernate config file is in
	 * the default package. Use #setConfigFile() to update the location of the
	 * configuration file for the current session.
	 */
	private static final ThreadLocal threadLocal = new ThreadLocal();
	private static SessionFactory sessionFactory;
	private static final String CONFIGURATION_FILE = "hibernate.cfg.xml";
	private static Configuration configuration = new Configuration();

	static {
		try {
			// Hibernate 3.X
			configuration.configure(CONFIGURATION_FILE);
			sessionFactory = configuration.buildSessionFactory();
		} catch (Exception e) {
			System.err.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
	}

	private HibernateSessionFactory() {
	}

	/**
	 * Returns the ThreadLocal Session instance. Lazy initialize the
	 * SessionFactory if needed.
	 *
	 * @return Session Session
	 * @throws HibernateException
	 *             HibernateException
	 */
	public static Session getSession() throws HibernateException {
		Session session = (Session) threadLocal.get();

		if (session == null || !session.isOpen()) {
			if (sessionFactory == null) {
				rebuildSessionFactory();
			}
			session = (sessionFactory != null) ? sessionFactory.openSession() : null;
			threadLocal.set(session);
		}

		return session;
	}

	/**
	 * Rebuild hibernate session factory
	 *
	 */
	public static void rebuildSessionFactory() {
		try {
			configuration.configure(CONFIGURATION_FILE);
			sessionFactory = configuration.buildSessionFactory();
		} catch (Exception e) {
			System.err.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
	}

	/**
	 * Close the single hibernate session instance.
	 *
	 * @throws HibernateException
	 *             HibernateException
	 */
	public static void closeSession() throws HibernateException {
		Session session = (Session) threadLocal.get();
		threadLocal.set(null);

		if (session != null) {
			session.close();
		}
	}

	/**
* @return session factory
	 *
	 */
	public static org.hibernate.SessionFactory getSessionFactory() {
		return sessionFactory;
	}

}